C#•2y ago

❔ Transform ASP.NET Core IdentityUser into a two-keys table

I need to modify the IdentityUser class so that it has two keys, id and companyId. I tried to extend the IdentityUser class like this

[PrimaryKey(nameof(Id), nameof(CompanyId))]
public class User : IdentityUser
{
    public int CompanyId { get; set; }

    [ForeignKey(nameof(CompanyId))]
    public Company Company { get; set; }

    public User() : base() {
    }
}

[PrimaryKey(nameof(Id), nameof(CompanyId))]
public class User : IdentityUser
{
    public int CompanyId { get; set; }

    [ForeignKey(nameof(CompanyId))]
    public Company Company { get; set; }

    public User() : base() {
    }
}

but, when I try to generate the migration data, I have the following error

The derived type 'User' cannot have the [Key] attribute on property 'CompanyId' since primary keys may only be declared on the root type. Move the property 'CompanyId' to 'IdentityUser' or remove 'IdentityUser' from the model by using [NotMapped] attribute or calling 'EntityTypeBuilder.Ignore' on the base type in 'OnModelCreating'.

The derived type 'User' cannot have the [Key] attribute on property 'CompanyId' since primary keys may only be declared on the root type. Move the property 'CompanyId' to 'IdentityUser' or remove 'IdentityUser' from the model by using [NotMapped] attribute or calling 'EntityTypeBuilder.Ignore' on the base type in 'OnModelCreating'.

Of course, since IdentityUser is a type from Microsoft, I don't think it's a good idea to change it. How should I do? Thanks

IdentityUser Class (Microsoft.AspNetCore.Identity.EntityFrameworkCore)

The default implementation of IdentityUser which uses a string as a primary key.

4 Replies

Angius•2y ago

Try the fluent config?

alkasel#159•2y ago

first time I heard of it, I'll take a look, thanks!

Angius•2y ago

In general, prefer fluent config over attributes And prefer convention over fluent config

Accord•2y ago

Was this issue resolved? If so, run /close - otherwise I will mark this as stale and this post will be archived until there is new activity.

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❔ Transform ASP.NET Core IdentityUser into a two-keys table